When Do Nutrients in Food Expire?
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Green Tea: 6 Months

A 2009 study in the Journal of Food Science showed that catechins (antioxidants linked with a reduced risk of some cancers) in green tea decreased markedly over time. After six months, catechin levels were 32 percent lower. Make the most of the antioxidants by storing tea in a sealed container in a dark, cool place.